Question

please explain...............​

Answer 1

Answer:

c) -c/d

Step-by-step explanation:

ax³+bx²+cx+d = 0

the roots are α, β, γ

α+β+γ = -b/a

αβ+βγ+γα = c/a

αβγ=-d/a

$now, \frac{1}{\alpha} +\frac{1}{\beta} +\frac{1}{\gamma} = \frac{\beta\gamma+\alpha\gamma+\alpha\beta}{\alpha\beta\gamma} = \frac{c/a}{-d/a} =-\frac{c}{d}$